/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.lee.util.xml;

import org.xml.sax.ContentHandler;
import org.xml.sax.DTDHandler;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.XMLReader;
import org.xml.sax.ext.LexicalHandler;

/**
 * Abstract base class for SAX {@code XMLReader} implementations. Contains properties as defined in {@link XMLReader},
 * and does not recognize any features.
 *
 * @author Arjen Poutsma
 * @see #setContentHandler(org.xml.sax.ContentHandler)
 * @see #setDTDHandler(org.xml.sax.DTDHandler)
 * @see #setEntityResolver(org.xml.sax.EntityResolver)
 * @see #setErrorHandler(org.xml.sax.ErrorHandler)
 * @since 3.0
 */
abstract class AbstractXMLReader implements XMLReader {

    private DTDHandler dtdHandler;

    private ContentHandler contentHandler;

    private EntityResolver entityResolver;

    private ErrorHandler errorHandler;

    private LexicalHandler lexicalHandler;

    @Override
    public ContentHandler getContentHandler() {
        return contentHandler;
    }

    @Override
    public void setContentHandler(ContentHandler contentHandler) {
        this.contentHandler = contentHandler;
    }

    @Override
    public void setDTDHandler(DTDHandler dtdHandler) {
        this.dtdHandler = dtdHandler;
    }

    @Override
    public DTDHandler getDTDHandler() {
        return dtdHandler;
    }

    @Override
    public EntityResolver getEntityResolver() {
        return entityResolver;
    }

    @Override
    public void setEntityResolver(EntityResolver entityResolver) {
        this.entityResolver = entityResolver;
    }

    @Override
    public ErrorHandler getErrorHandler() {
        return errorHandler;
    }

    @Override
    public void setErrorHandler(ErrorHandler errorHandler) {
        this.errorHandler = errorHandler;
    }

    protected LexicalHandler getLexicalHandler() {
        return lexicalHandler;
    }

    /**
     * Throws a {@code SAXNotRecognizedException} exception.
     *
     * @throws org.xml.sax.SAXNotRecognizedException always
     */
    @Override
    public boolean getFeature(String name) throws SAXNotRecognizedException, SAXNotSupportedException {
        throw new SAXNotRecognizedException(name);
    }

    /**
     * Throws a {@code SAXNotRecognizedException} exception.
     *
     * @throws SAXNotRecognizedException always
     */
    @Override
    public void setFeature(String name, boolean value) throws SAXNotRecognizedException, SAXNotSupportedException {
        throw new SAXNotRecognizedException(name);
    }

    /**
     * Throws a {@code SAXNotRecognizedException} exception when the given property does not signify a lexical handler.
     * The property name for a lexical handler is {@code http://xml.org/sax/properties/lexical-handler}.
     */
    @Override
    public Object getProperty(String name) throws SAXNotRecognizedException, SAXNotSupportedException {
        if ("http://xml.org/sax/properties/lexical-handler".equals(name)) {
            return lexicalHandler;
        } else {
            throw new SAXNotRecognizedException(name);
        }
    }

    /**
     * Throws a {@code SAXNotRecognizedException} exception when the given property does not signify a lexical handler.
     * The property name for a lexical handler is {@code http://xml.org/sax/properties/lexical-handler}.
     */
    @Override
    public void setProperty(String name, Object value) throws SAXNotRecognizedException, SAXNotSupportedException {
        if ("http://xml.org/sax/properties/lexical-handler".equals(name)) {
            lexicalHandler = (LexicalHandler) value;
        } else {
            throw new SAXNotRecognizedException(name);
        }
    }
}
